If you are looking for specific visual guidance, makers like Lala Sewz offer great tips for sewing basics, and detailed DIY Lounge Pants tutorials are available to walk you through the cutting notes for this style of garment.
Cotton flannel, jersey knit, or brushed fleece. For a luxe feel: Satin or lightweight silk. For summer wear: Cotton lawn or breathable linen. Quick Construction Overview: 7382zip
Since these are lounge pants, consider adding "on-seam" pockets or a contrasting drawstring for a custom look. If you are looking for specific visual guidance,
Always pre-wash your fabric to prevent shrinking after the garment is finished. 7382zip